Aircraft



Jan. 19, 1943.

w. H. BARLING AIRCRAFT Filed June 18, 1940 z sheets-sheet 1 abkywun 5 Jan. 19, 1943.

w. H. BARLlNG r2,308,802

AIRCRAFT Filed June 18, 1940 2 Sheets-Sheet 2 1 the present invention,

Patented Jan. 19, 1943 T oi-EICE nerr walter n. Baroni, santa om, cam'. Application June is, 1940, serial No. 341,169

16 Claims.

This invention relates to aircraft.

One object of the invention is the provision of an aircraft adapted for high speed travel in normal ilight and capable of taking ofi and landing in a substantially vertical direction.

Another object of the invention is the provision of an aircraft adapted to take off and land substantially vertically, and having a tail structure which is movable axially of the body, with a shock absorbing connection between tail structure and the body for effectively cushioning the shock of landing.

Another object of the invention is the provision, in an aircraft, of a propeller capable of efficient operation at various speeds of travel through the air, and having blade sections that are relatively adjustable to assume diil'erent pitch angles at dilferent distances along the blade axis.

Another object of the invention is the provision of an aircraft having a lifting propeller and capable of substantailly vertical flight, the propeller driving engine or engines being releasably connected to the aircraft body on which the propeller is rotatable so that the engines may descend independently of the aircraft body in case of engine failure.

Another object of the invention is the provision of an aircraft adapted to 'take off and land vertically and having control surfaces which. act during horizontal night, as rudders, and elevators, and which are differentially moved under the control of the operator for roll control.

Other objects and advantages of the Ainvention will be apparent from the following description, the appended claims, and the accompanying drawings.

n the drawings,

Fig. l is a plan view of an aircraft embodying and shown partly in longitudinal section;

Fig. 2 is a side elevation of the aircraft;

lFig. l3 is a plan of the controls; and

Fig. 4. is a top view of the control column.

The drawings show a preferred embodiment of the invention in an aircraft adapted to take olf and land in a vertical j direction and adapted for high speed flight in a substantially horizontal attitude. Referring more particularly to the drawings, in which the same reference numerals have been used to designate like parts in th'e several views, l ge erally designates the body portion of th`main frame structure. This body portion includes rigid structural members and is provided with a covering I2 of substantially 'body portion,

comparatively small, as will be apparent from.

Fig. l.

Within the body l o is a pilots seat l5 arranged somewhat to the rear of the center of gravity which is adjacent the center of lift of the wings. At each side of the body is a tank i6, having a compartment il for gasoline and additional compartments it for the engine oil and i9 for shock absorber oil. One of the tanks only is shown in Fig. l, another tank at the left side of the' body being of the same construction as the one shown. Any suitable number of engines may be employed -for driving the propellerpr propeller-s, the construction illustrated embodying four engines 2li the longitudinal axes of which are parallel to the longitudinal axis of the aircraft. On the crankshaft of one of the engines 29 is a drive gear 2l which. meshes in normal operation with a gear 22 iixed'on one of the propeller `shafts such' as the propeller shaft 23. A second engine, preferably the one diamet- 'rically opposite, is similarly connected to the propeller shaft 23, while the third and fourth engines are provided, with drive gears 2d meshing with a gear 25 on the other propeller shaft 2t.

The propeller shaft 23 is rotatably mounted by means of suitable antifriction bearings '2l and 2e in Eline with' the body axis and carries the propeller hub 3@ of the upper propeller which has blades 3i and 32 of considerable length -which may be pivotally connected to the hub for movement about hinge axes forauto-rotational operation. The length of these blades is preferably such that they extend out about as far as the ends of the wings from the body axis. The lower propeller includesthe hub 33, xed to the propeller shaft 26, and the blades 'and 35. .As shovm, the two propellers are adapted for rotation in opposite directions and are provided with blade sections the axes of which bear a xed relation to the axis of the propeller shaft, although the invention is not to be limited to such arrangement.

'lhe aircraft, which is adapted to rise vertically r'rom the ground and also adapted to travel at high speed in substantially horizontal night requires a propeller that will satisfy both of these conditions, and to enable the aircraft, at times, to hover substantially stationary, with satisfactory propeller etliciency, and at other Vtimes to travel rapidly througlrthe airl at diierent spfeeds.

as desired, each propeller has blades comprising a number of sections which are relatively adjustable to different pitch angles. Thus the blade 3| has an outer section 31 carried by a shank portion 38 which is rotatably mounted in the propeller hub for movement about the longitudinal axis of the blade. This motion, providing adjustment of the pitch angle of the section 31, is preferably accomplished by longitudinal movement of a collar 39, causing tilting movement of a lever arm 40 which is pivotedat 4| on a post 42 carried by the hub. The outer portion of the arm 40, which may be straight or of other suitable form, is provided with a link 43 pivotally connected to an ear or crank 44 projecting from a collar 45 which is fixed to the shank 38. Rotatably mounted on the rshank 38 is the blade section 41, of suitable airfoil form in'cross `section. Fixed to the section 41 is a sleeve 49 which carries a collar 50 having a crank connected by link 5| to the lever 48. Inwardly of the section 41 and rotatably mounted on the sleeve 49 is a blade section 53, also of airfoil cross sectional form. A link 54 interconnects the lever 48 and a crank on this section 53.

'I'he angles through which the blade sections 31, 41 and 53 move, as they are simultaneously adjusted, depend upon the lengths and relative angular relation of the several cranks to which the links 43, 5| and 54 are pivoted and upon the shape parts peller in high pitch adjustment, corresponding to high speed in level forward flight, the angle of incidence of section 53 is considerably in excess of the angle of incidence of section 41, and the angle of section 41 isl considerably in excess f the angle ofsection 31. Moving the control to decrease the pitches of the sections from this high speed condition, the angular adjustment of section 53 would be a little more than the angular adjustment of the section 41 and the angular adjustment of section 41 alittle more than secof the outer portion of lever 48. These. are so related that, starting with the proin construction to one described. The collar is operated by an axially movable lrod -56 vwhich extends rearwardly to a control handle 65 which l may be controlled by the operator'to shift it forwardly or rearwardly as occasion may require.

Between the bladev sections 31 and 41 is a blade section 52, hinged along a diagonal hinge line- Vto the section 31 and connected by an operating pin 58 to an arm 59 projecting from the blade section 41 so that as the blade Vsection 41 is turned, the inner part of the trailing edge portion of the section 31 is adjusted as toits blade angle.

The blades 34 and 35 of the lower propellerare also provided with adjustable blade sections similar in construction to the blade sections of the upper propeller. These blade sections are controlled by lever arms 50, operated by a rotatable collar 5| which rotates with the propeller shaft 23 but which is longitudinally movable along that shaft by a control tube 63 having a pin 84 extending through a longitudinal slot in the propeller shaft.A The tube 63 at its inner end `is provided with a collar 68 by means of which it can be longitudinally moved through operation of a control handle 58.

In case of failure of one of the engines, the

construction is such as to permit the gears onthe engine crankshafts to be moved out of mesh with the gears 22 and 25 or to permit the entire release of an engine or engines which may descend to the ground independently of the b ody. The engine 2|), as shown in Fig. l, is bolted to a carrying frame 10 which is provided with curved ribs 1| received in curved guide walls f 12. The guides 12 are fixed to the engine suption 31 for the first part of the adjusting movement. 4 As the control `motion continues the angular adjustment of section 53 greatly exceeds that of section 41 and that of section 41 exceeds the adjustment of section 31 until finally all the sections have reached a small angle to the plane of rotation of the propeller, corresponding to the adjustment for vertical descent in autogyration. with the engines disconnected. The condition for vertical ascent is between the two end conditions just mentioned. Thus the propeller provides for an eillcient propelling or lifting efl'ect throughout ther entire blade length when the aircraft is traveling at high speed through the air, when hovering substantially motionless inthe air, when taking olf, and during descent with the engines released from the propellers. During such descent, with the propellers auto-rotating, their sustaining effect is such as to prevent the aircraft from hitting the ground with a speed in excess of that which can be safely absorbed by the shock absorbing means. As the aircraft descends it is controlled as to position or attitude, as will be presently described.

The collar 38, which controls the pitch angle of the blade sections, is under the control of the operator, being provided with an annular track or groove receiving the ball end of the lever 48 which of course rotates with the propeller and with respect vto the stationary collar 39. The collar 38 also operates the lever for the blade opposite `through a mechanism which is similar porting structuren which is secured to or forms a part of the frame structure of the body l0, the engine frame 18 normally resting against the supporting structure 13 and being held in that position by releasable locking devices shown in the form of pins 14, preferably conical in form and entering correspondingly shaped sockets in the guide walls 12 and also entering slots 15 in the ribs 1|. With the engine in its normal position the inner sides of the pins 14 are at the 4 ends ofthe slots and engage the inner portions of the curved ribs 1|, but when the pins 14 are retracted, the engine can move outwardly, and is urged outwardly by a compressed spring 11 until the ends of the slots in the ribs are brought up against additional pins 18. The gear 2| is thus moved out of mesh with the gear 22.

If it is desired to drop the engine entirely,

the pins'18 lare retracted, thus removing restraint to continued outward movement of the engine, and the spring 11 forces the engine away from the longitudinal axis of the aircraft. In its outward movement, the. engine is guided and controlled so that it will not strike the wing or strike one of the tail surfaces. Guide arms project from the body structure and are arranged on opposite sides of a rigid bar 8| which is fixed to the engine frame 10 so that it will move with the engine, the lower end of the bar 8| bearing on a fulcrum pin 82 carried in xed position by a supporting bracket 83 at a point considerably below the center of the engine. 'Additional guide arms 84 cooperate with the lower portion of the bar 8| and control its movements so that the engine will be forced totravel in a plane which intersects the longitudinal axis of the aircraft at an angle of about 45 to the surface of the wings. The fulcrum pin 82 is the center of curvature Aof the .ribs 1| and the walls in which those ribs are guided. The engine is moved out far enough so that the bar 8| clears the guides 80 and 84, and then continues to move 'outwardly untilthe U-shaped lower end of the bar 8| can 'release itself from the pin 02, when theC-digine falls between adjacent tail surfaces. The end of the bar 8| is preferably connected by a cable 85 to a parachute 86 which is packed in a compartment in the empennage, and which may be pulled lout automatically by the ,weightY ofthe engine `so that the-engine can descend under theisupport of the parachute which is caused to open automatically in` any suitablemanner. In the same way, each of the other' engines are similai-ly mounted and provided with their own in-v dividual parachute connections. Preferably each engine is connected to and formsa support for a portion of the skin or shell of the body, while the remaining portions ofthe skin or shell are fixed to the body frame itself. Thus as shown in Fig. 2, the engine 20 hasxed to it the shell wall 98, and the lower engine on the same side 'of the aircraft forms a support` for the shell portion 89, while the shell portion` 90 is fixed to the body frame' structure. In Fig. 1 the aircraft is shown with the skin or shell portion 90 of the upper side of the body removed,'for more readily revealing the construction.

erably reinforced along their edges to constitute guiding means forfthe stabilizing iln'structure. As the tail collapses with respect to the body, the guy wires |04 which normally hold the tail structure quite rigid, are slackened or goloose. During flight, the shock absorbing plungers 98 are in their extended positions and are held so v'by latch levers |05 which engage notches in the plungers and hold them in their fully extended positions. After landing,v and preparatory to launching again, the shock absorbing plungers 98 are moved to extended positions by the pilot who opens a control vvalve which establishes lcom- The pins 14 are connected to pistons operable f in cylinders 9|, and these pins are simultaneously moved to retracted positions by supplying fluid I under pressure to the outer sides of cylinders,

through suitable supply pipes 92 which are connected to a suitable pressure supply source through a control valve which maybe manually operated from the pilots location. A second control valve is provided to supply fluid to the outer ends oftliecylinders 93 .to retract the pins 18, the pins 10 lfoi: any engine being ycontrolled independently of the pins 14 of that engine, and

independent controls being supplied for the several different engines so that theymay be released ordropped independently.v

When `the engines are dropped, torelieve the body of their weight, the gaSolinefr'om'the gas tanks I1 may be dumped by opening dump. ,valves 93.

At the rear end of the body I 0 is an empennage or tail structure 94 on which the `aircraft is adapted to land in a substantially vertical de ,V -scent under normal conditions. 'I'his tail struc- :I tyre is telescopically associated with the main body and is provided with a shock absorbing connection to absorbI the shock of landing. As will Ybe apparent from Figs. 1 and 2, the tail structure includes a frame 95 forming a support for horizontal stabilizing ns L96` and vertical fixed fins 91 Fixed tothe frame 95 -are.'a plurality of shock absorbing plungers v98 which are axially movable in the iiuid pressure cylinders '99. yThe upper ends of the cylinders 99.A are closed except for-a by-p'ass opening which permits a restricted rate o f ow of oil from the cylinders ba\ Irlthrough the pipes |00 to the reservoir I9 in which the shock absorber oil is stored. When landing, the

upper ends of the cylinders 99 are in communication "withthe; shock absorber oil reservoir throughthese restricted openings s o that when landing, and the weight ofl the body is applied to the tail structure, the shock is gradually absorbed as the plungers 98 move upwardly into the `cylinders. During such upward movement the stabilizing fing 95 and 91 travel along slots |02 in the 's hee't 'metal cover or skin 90 of the rear portion of the body, these slots being prefmunication through a'v pipe line |00 yconnected to van engine driven pmp so that oil may be forced from the shock absorber oil reservoir I9 to the upper sides of the cylinders 99, the flow through therestricted or leak orifices at the topsfof the cylinders into the pipe |00 being prevented at this time by closing the valve |01. After the plungers 98 are fully extended the latchlevers |05 are moved in to latching position.

The nxea stabilizing uns 9s form a support for i elevators |08 and |09, which are hingedly ,connected along hinge lines IIO and are provided with control horns Y|||` and- I|2.` 'Ihe vertical fins 91 pivotally carry the vertical rudders ||3 Y and ||4 having control arms or horns |I5 and I lIG respectively. At the outer ends of thelvertical and horizontal ns .are ground runnersY |I1. 'Ihese runners are preferably kswiveling wheels carried by 'verticallyextendingpiston` rods H8 which-may be provided with suitable auxiliary shock absorbing devices affording some `yielding movement of the shaftswith respect -to cylinders 'd I I9 in which they are axially i'novable., As willl be noted, these runners are mounted at points widely spaced from the longitudinal axis of the aircraft so ythat the latter willv be supported in a ,stable position when on the.'ground,andl are effective to promptlyvright the aircraft incase the latter descends in anvinclined position. The lower end of the central portion` of theytail` structure 94 carries a main` landing wheel |20 from which the main shock of landing is transable inbearings |26 carried by the body. yThe finner end of each of these" shafts carries a .bevel gear |21, meshing with a bevel piniczln` |28 which is rotated by shaftl |29 carrying abevelgear |30 at its upper end. The bevel gear |30 meshes lwith a bevel gear I 3| fixed 'tothe hand wheel |92.. Rotation of the'hand 'wheel'` thus causes movement of the shafts |24 and |25 in opposite directions.` ',I'hese two shafts arefprovidedwith control armsv |133 andv |34 "respectivelywhi'h are connected by cables |35 and |35 to the elevators suchthat as the centra columnas la whoie is rocked forwardly or rearwardly from itsr normally Y upright position, lt causes rvsimilar rotation rol'ithe shafts |24 .and l|25y in 'the same direction, and

the elevators |08 and |09 are moved similarly in the saine direction, forward rocking `of the control column lowering the elevators. As 'the hand wheel |32 is turned about its own axis to differentially move the elevators, a` differential movement of the ailerons also produced through a cable connection to the aileron control c `shafts |31 and |38.v These shafts are interconlnected by a cable |39, .and also by cables |40 and c |4| which extend into passages in the shafts |24 and |25 and project through lateral openings in those shafts,` being'interconnected to a chain |43 guided over guide pulleys |44 and extending around a sprocket'wheel |45 which is xed to the bevel gear |3|-. The ailerons are thus moved dinerentially at the same time the elevators are moved differentially, so that the elevators and the ailerons'cooperate to produce a roll in onev di-4 rection or the other, depending upon the direction of rotationvof thehand wheel. As the hand wheel is rotated, the vertical rudders are also moveddierentially and cooperate with the elevators and ailerons to produce a rolling movement; 'I'his movement of the rudders is .obtained from a cable connection between the horns IIS and ||6' on the upper and lower rudders and pivoted'levers |48 andl|49 fixedto sleeves |54 which are rotatably movable about axes extending generally parallel to the controlcolumn |23.l

or horns extending longitudinally Y. towards the tail structure and these horns areinterconnected by a cable which is operated by the control wheel.

As will'be apparent from Fig. 3,the two control ,aime ils and ns et one sident the vertieei axis are connected by control cables |50 and yISI to 2,308,802. i Y a tudinei exis end to givel e desired positioning et.

the aircraft axis with respectto the vertical The ground may bo approached kslowly so ythat Iit might be unnecessary touse the shock absorbing connection between the empennage and the main` body of the aircraft, but to fully cushion the shock of landing in caseof'a more rapid descent,

-the pilot operates the latch levers "1|" so that the fluid Ipressure shock absorbers will be effec# tive in permitting and #cushioningl telescoping` movement of the empennage with reSDet tothe main: body portion. lliig.- l shows the,l telescoped position of the empennage in dotted lines. The control for thel tail surfaces is `fully effective until l the ground is reached. although the control cables connected to they tail surfaces slacken during telescopic movement of the tail portion.- The ground engaging wheels cause the'aircraft to bev automatically righted in case its longitudinal axisA is not verti at the timeof ground contactand permit the aircraft to be readily moved about on the ground. A;

f The sleeves |54 have projecting operating arms In cese tif-engine fnii'ure drone 'of the l during night,lv that engine may be disconnected from its propeller and a4 safe descent effected v under the control-of the other engine or engines., without dropping the stalled engine` from the air-I craft.

With only one`engine` driven propeller;` incase of failure of the engine or engines whichdrive the other propeller, the torque .tending to turn.

' the body about its own, axis can be effectively opposite ends of the lever |48, and the arms on I the two vertical rudders at the other sideof the vertical axis are connected by cables |52V and |53 to the lever |49. The rearwardly extending horn onlever |48 is connected at its rear end to a control cable |55 which is` secured tothe cable |40. llhe horn on lever |49 is yconnected by control cable |51 to the cable V|4|. As the control cables |40 and |4| are moved during aileron control, the levers |44 and |44 are causedv to swing about their ownaxes to move the upperrudder in one direction and the lower rudder in I an opposite direction.

. During flight,` the two rudders can-.be moved in the same direction by operating the rudder .pedals |49 and |60 on which the arms |44, and |44 are pivotally carried. `The rudder pedals, which have foot 'receiving bars arranged inside of the arms `|43and |49, are rotatably carried .in suitable bearings IBI .to rockfrorwardly and rearwardly from normal upright positions, under the control of the operator. As one pedal isimoved forwardf lythe'other moves rearwardly, operating the rudders in the same direction for steering WIPOses. l

As will now be apparent, theaircraft is capable counteracted by turning hand wheel and thus' moving the4 ailerons'diilerentially, and moving the elevators and rudders differentially to prevent ro-y lf tation of the aircraft on itsown axis.

In case all of the 'engines should fail,

gines may all -be disconnected entirely from the' aircraft and descend withtheir own parachutes,

and the gasoline isdumped from the gas tanks. The propeller, blade sections 4are then adjusted to their most eillcient blade angles for autof'rotaand that changes may be made therein without of high speed operation during flight, `in which the sustaining plane's areeffective to provide the propeller being capablelof adjustment `to operate efficiently at various speeds of travel. When it is desired to land, the nose of the aircraft is pointed upwardly and the speed of lthemotors controlled so vthat the aircraft can dscend,tail downwardly, .the pitch of the 'propeller'.,blade sections being Vadjusted to provide an efficient oper-` ation at times when the aircraft is moving coni--` paratively slowly through the air. During descent 1 adequate uit, and'in horizontal night mutanti-oi Y is providedior roll and for directional control,

tion.

and until the ground is reached, the controls are is defined in the' appended claims.

' departing from the scope ofthe invention which whstiseinimedisp. -v

. 1. In any aircraftL a mainframe, a"Y propeller Y rotatablymounted in said frame, an engine `car- 1' ried by said frame foridriving the propeller.'

means fordisconnecting the engine from the propeller for autorotation .of the propeller during 'descentofgthe aircraft with the propeller axis substantially vertical, a tail structure telescopi,` cally connected ito` frame for lmovement in a direction'parallel-tn thepropeller axis and adapted Pto receive'l the weicht vof the main frame whilelandingwith the propeller axis substantially vertical. said tail-structure having ilight con.-

troll surfaces, fluid controlledxshockf` absorbing A means betweenmaiirfram'eand the tail structure for cushioning theweight of the main framel during landing, and fluid, pressure Supply means;` ,i

for moving the tail structure toits extended posi- .2. In an aircraft, a main body frame, iti-prol` effective to turn the aircraft about its own longif peller rotatably4 mounted in said frame, an engine i carried by said frame for driving the propeller, a tall structure forming a streamline cmltinuation of the main body frame and telescopically connected to the main frame for movement in a direction parallel to the propeller axis and adapted to receive the weight of the main frame while landing with the propeller axis substantially vertical, uid pressure shock absorbing means between the main frame and the tail structure for cushioning the shock of landing, uid pressure supplying means under the control of the pilot for extending the fluid pressure shock absorbing means against the weight of the main body frame, and a controllable latch for holding Vthe tail structure in extended position.

3. In an aircraft capable of vertical ilight, a main frame, a propeller rotatably mounted in said frame, an engine carried by said frame forl driving thepropellerVmeans for disconnecting the engine from the propeller and from the main frane during iiightya tail structure having controllable airfoils extending to opposite sides of 'the longitudinal axis of the frame, :duid controlled shock absorbing means supporting said tail structure on the main frame for movement in the direction of the longitudinal axis of the frame and having a capacity foredectively cushioning the shock of landing of the main frame with the propeller axis substantially vertbcal, and control means connected to said air foil surfaces and operable to move them in the same direction and in opposite directions at the will of the operator.

4.111 an aircraft, a main frame, an engine mounted in' said frame, a propeller rotatably mounted in said frame and' having a blade formed oi? relatively adjustable sections, means for detachably connecting the engine in driving relaleasable means for normally holding said engine in predetermined position on the frame structure and operable to release the engine from the propeller and for movement outward of the longitudinal axisof the frame structure while such longitudinal axis is arranged substantially vertically,

guide means carried by said frame structure,

and a, pivotally mounted fulcrum arm carried by said engine and guided by said guide means for controlling the outward movement of the engine with respect to the frame structure to prevent the engine from striking projecting portions of the framestructure. v

8. In an aircraft, a frame structure, a propeller rotatably mounted in said frame structure, means operable during flight for controlling the pitch angle of the propeller blades, an engine carried by said frame structure for driving the propeller, means for detachably connecting the engine in driving relation to the propeller, said frame structure having sustaining planes projecting outwardly with the tips` of the planes having l approximately the same distance from the longition to the propeller, control means providing a predetermined differential control of the pitch angles of the sections of the blade during iiight, and a tail structure telescopically Aconnected to the main frame for movement in the direction of the propellerY axis and adapted to receive the weight of the frame while landing with the propeller axis substantially vertical, and cushioning means between the main frame and the tail structure for absorbing the shock of landing,

5. In an aircraft, a main body, a plurality of oppositely rotating propellers rotatably mounted in said body, 'drive means in said body for said propellers, means for detachably connecting the drive means in driving relation to the propellers, said propellers having blades each comprising relatively movable blade sections of adjustable pitch angle, and mean: providing a predetermined diierential control of the relative pitch angles of the blade sections during flight to impart greater angular movement to sections closer to the propeller axis than sections more remote from the propeller axis.

6. In an aircraft, a body, a propeller rotatably mounted in said body, an engine for driving the propeller, means for mounting said engine for movement outward of said body in a direction generally axially of the engine, means for releasably latching the engine on the body and operable to release the engine from the body and from the propeller, and means for controlling the relative outward movement of the engine from the lbody after the engine latching means is released.

7. in an aircraft, a frame structure, a. propeller rotatably mounted in said frame structure, an engine for driving said propeller. re,

tudinal' axis of the frame structure as the tips of the propeller blades, a tail structure telescopically connected to the frame structure for movement in the direction of the propeller axis, uid controlled shock absorbing means for cushioning the shock of landing with the framestructure in a substantially upright position, said tail structure having laterally projecting stabilizing surfaces and elevators and having vertical uns and rudders extending substantially at right angles to the elevators and-projecting to opposite sides of the longitudinal axis of the frame structure, and ground runners carried by said stabilizing surfaces and ilus at points remote from the longitudinal axis of the frame structure.

9. In an aircraft adapted for vertical flight, a main body of generally streamline form, lateral sustaining planes projecting on opposite sides of the body, a tractor propeller at the nose portion of the body, an engine carried by said body for operating the propeller, means detachably connecting the engine to the propeller and to the body, said propeller having blade sections providing adjustment during ight of the pitch angle of a portion of a blade with-respect to other portions at other distances from the propeller axis to provide autorotational eectiveness, an empennage having airfoil surfaces, means supporting the empennage for movement longitudinally of the body'. and uid controlled shock absorbing means for cushioning the collapsing movement oi. the empennage with respect to the body while landing on the empennage.

1G. in an aircraft adapted for both forward flight and for landing and taking oi on its tail, a frame, a tractor propeller rotatably mounted on said frame, said propeller having blades comprising relatively movable inner and outer blade sections mounted for relative rotational movement about the `blade axis for pitch angle variation to provide autorotational effectiveness, controllable means for di'erentially controlling the pitch angle of the sections of a blade. and means actuated by said controllable means for adjusting said blade sections with relatively similar pitch for auto-rotation, with an'inner section having a slightly greater pitch than an outer secnight and for landing and taking on on its tail, a propeller having blades comprising a plurality of relatively adjustable blade sections disposed at different distances from the propeller` axis, common means for simultaneously changing the pitch angle of the blade sections through different predetermined angles inversely in accordance with the distance of the section from the propeller axis, and means actuated by said coinmon means for adjusting said blade sections with relatively similar pitch for auto-rotation, with an inner section having a slightly greater pitch than an outer section for sustentation, and. with an inner section having substantiallyV greater pitch than an outer section for forward night in the direction of the propeller axis.

l2. In an aircraft adapted for both forward night and for landing and taking on on its tail, a propeller having blades each comprising an outer section and a pivotally mounted Vinner section of variable pitch angle and arranged :remote from the blade tip, controlling means operable during night to adjust the inner section on its pivot with respect to the outer section to alter its pitch angle and providing for forward night of the aircraft substantially in line with the axis of said propeller, an engine for driving the propeller, and means for releasing the engine from the propeller to provide free rotation of the propeller'in Adescent of the aircraft with its axis arranged substantially vertical.

13. In an aircraft adapted for vertical night, a longitudinally extending main frame,a tractor propeller carried by said frame, an empennage carrying the frame in a substantially upright' position thereon and 'on which landing is enected with the propeller axis substantially vertical, an

engine for driving the propeller, a drive gear operated by the engine and in drivingconnection with the propeller, means on the frame normally supporting and securing the engine in normal position, means for releasing said engine supporting means providing for limited outward movement of the engine from the longitudinal axis of the frame to an extent'su'nlcient to release thedrive gearl from driving connection with the propeller, and means to adjust the propeller for effective auto-rotation during descent of the aircraft with the propeller axis substantially vertical.

14. In an aircraft adapted for vertical night,

CII

1 propeller, means forv adjusting the propeller for effective auto-rotation free from the engine, a

drive gear operated by the engine andI in driving connection with the propeller, means on the main frame supporting and securing the engine in normal position, means for releasing said supporting means providing for outward movement of the engine from the main frame axis to an extent snicient to release the driving gear from driving connection with the propeller, and additional means operable to release the'engine for continued outward movement entirely free of the frame.

15. An aircraft capable of vertical and horizontal night and of vertical landing, comprising a main frame having a longitudinally extend# ing axis and having laterally extending Wings, a tail structure adapted to carry the main frame in a substantially upright position thereon and on which landing of the aircraft can be made. a fluid controlled shock absorbing connection between the tail structure and the main frame. an

engine, a tractor propeller carried by the main' frame, a quickly releasable connection between the engine and the propeller, and means mounting the engine on the frame for quick release from the frame and propeller during night.

16. An aircraft capable of vertical and horizontal night and of vertical landing,.compris ing a main frame having a longitudinally. extending axis and having laterally wings, a tail structure including controllable airfoils and adapted to carry the main frame in a substantially upright position thereon and on which landing of the aircraft can be made. a i

shock absorbing connection between the tail structure and the main frame, an engine, a tractor propeller carried by the main frame and having controllable pitch blades, a quickly releasable gear connection between the engine and the propeller, and means mounting the engine on the frame for quick release fromthe frame- K and propeller during night. W

ALTER n. Baluma.

extending 

